/Engine/Source/Runtime/Landscape/Classes/LandscapeComponent.h
Update collision component dominant layer data
void UpdateCollisionLayerData ( const [FColor](API\Runtime\Core\Math\FColor) *const * WeightmapTextureMipData, const [FColor](API\Runtime\Core\Math\FColor) *const *const SimpleCollisionWeightmapTextureMipData, int32 ComponentX1, int32 ComponentY1, int32 ComponentX2, int32 ComponentY2 )